The classification of the impingement of tissues of the shoulder joint complex has evolved into two major categories: external and internal. External impingement occurs when the soft tissues around the joint, primarily the rotator cuff, are pinched between the humeral head and the overlying acromion. Since the impingement occurs outside the joint capsule, the impingement is considered “external” in contrast to inside the joint. Internal impingement occurs when the compression of tissues occurs between the humeral head and the glenoid fossa. Multiple passive movement tests have been shown to create pain when external impingement is present. The purpose of this study was to determine if these same tests could re-create internal impingement (a false positive for external impingement).